NEET 2014
- Exam
- NEET
- Year
- 2014
- Subject
- Botany
- Chapter
- Cell Cycle and Cell Division
NEET 2014 · Botany · Cell Cycle and Cell Division
In the 'S' phase of the cell cycle:
In the 'S' phase of the cell cycle:
Options
- AAmount of DNA doubles in each cell
- BAmount of DNA remains same in each cell
- CChromosome number is increased
- DAmount of DNA is reduced to half in each cell
Correct answer
A. Amount of DNA doubles in each cell
Step-by-step solution
S-phase/Synthetic phase
(a) DNA replicates and its amount becomes double (2C 4C).
(b) Synthesis of histone proteins.
(c) Euchromatin replicates earlier than heterochromatin.
(d) Synthesis of NHC (non-histone chromosomal proteins).
(e) Each chromosome has 2 chromatids. Amount of DNA doubles but the chromosome number remains constant.